﻿/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2012  Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace Greenshot.Controls {
	/// <summary>
	/// A simple ToolStripDropDownButton implementing INotifyPropertyChanged for data binding.
	/// Also, when a DropDownItem is selected, the DropDownButton adops its Tag and Image.
	/// The selected tag can be accessed via SelectedTag property.
	/// </summary>
	public class BindableToolStripDropDownButton : ToolStripDropDownButton, INotifyPropertyChanged {
		
		public event PropertyChangedEventHandler PropertyChanged;
		
		public BindableToolStripDropDownButton() {
		}
		
		public object SelectedTag {
			get { if(Tag==null && DropDownItems.Count>0) Tag=DropDownItems[0].Tag; return Tag; }
			set { AdoptFromTag(value); }
		}
		
		protected override void OnDropDownItemClicked(ToolStripItemClickedEventArgs e) {
			ToolStripItem clickedItem = e.ClickedItem;
			if(Tag == null || !Tag.Equals(clickedItem.Tag)) {
				Tag = clickedItem.Tag;   
				Image = clickedItem.Image;
				if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelectedTag"));
			}
			base.OnDropDownItemClicked(e);
		}
		
		private void AdoptFromTag(object tag) {
			if(Tag == null || !Tag.Equals(tag)) {
				Tag = tag;   
				foreach(ToolStripItem item in DropDownItems) {
					if(item.Tag != null && item.Tag.Equals(tag)) {
					   	Image = item.Image;
					   	break;
					}
				}
				Tag = tag;
				if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("SelectedTag"));
			}
		}
	}
}
